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Free events hard to read

Hi all,
I migrated to Zimbra after Thunderbird stopped being supported.
I've been using Zimbra as a desktop interface for Google Calendar, which I use for work and personal stuff.
I have noticed that when I create events where I list myself as "free," (meaning not busy), then they show up as very dim on the calendar. THat makes it hard to read. I know it's kind of picky, but I don't want to list e.g. birthdays as "busy" but still want them easy to read.
Does anyone have a way to make the free events show up brighter or more easy to see in some other way?
Thanks